Steel material, and steel material manufacturing method

A manufacturing method, steel technology, applied in the field of steel, and steel manufacturing, can solve the problem that the SSC resistance cannot be obtained stably, and achieve the effect of excellent SSC resistance

Inactive Publication Date: 2019-09-13
NIPPON STEEL CORP
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0019] However, even if the technologies disclosed in the above-mentioned Patent Documents 1 to 9 are applied, in the case of steel materials (such as ste

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  • Steel material, and steel material manufacturing method
  • Steel material, and steel material manufacturing method
  • Steel material, and steel material manufacturing method

Examples

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[0195] Example

[0196] 180 kg of molten steel having the chemical composition shown in Table 1 was produced.

[0197] [Table 1]

[0198]

[0199] An ingot was produced using the above molten steel. The ingot was hot-rolled to produce a steel plate with a plate thickness of 20 mm.

[0200] The hot-rolled steel plates of each steel number were naturally cooled so that the temperature of the steel plate was normal temperature (25° C.).

[0201] After natural cooling, the steel plates of each test number were reheated to the quenching temperature (920° C. for the austenite single-phase domain) and soaked for 20 minutes. After soaking, the steel plate was dipped in a water tank and quenched. At this time, the cooling rate during quenching (CR 800-500 ) is 400°C / min. For Test No. 23, after soaking at the quenching temperature, cooling was performed by immersion in an oil bath. At this time, the average cooling rate between 800°C and 500°C was 40°C / min.

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Abstract

Provided is a steel material that has a yield strength of 965MPa to 1069MPa (140ksi grade), and has superior SSC resistance. This steel material has a chemical composition that includes, by mass%, more than 0.50% and less than or equal to 0.80% C, 0.05% to 1.00% Si, 0.05% to 1.00% Mn, less than or equal to 0.025% P, less than or equal to 0.0100% S, 0.005% to 0.100% Al, 0.20% to 1.50% Cr, 0.25% to1.50% Mo, 0.002% to 0.050% Ti, 0.0001% to 0.0050% B, 0.002% to 0.010% N, and less than or equal to 0.0100% O, the remainder consisting of Fe and unavoidable impurities. The steel material includes 0.010mass% to 0.060mass% solid solution C. Furthermore, the yield strength is 965MPa to 1069MPa, and the yield ratio is greater than or equal to 90%.

Description

technical field [0001] The present invention relates to a steel material and a method for producing the steel material, and more specifically, relates to a steel material suitable for use in an acidic environment, and a method for producing the steel material. Background technique [0002] Oil wells and natural gas wells (hereinafter, oil wells and natural gas wells are collectively referred to as "oil wells") have become deeper and higher strength steel pipes for oil wells are required. Specifically, 80ksi class (yield strength 80 to 95ksi, ie, 551 to 655MPa) and 95ksi class (yield strength 95 to 110ksi, ie, 655 to 758MPa) steel pipes for oil wells have been widely used. 110ksi grade (yield strength is 110~125ksi, that is, 758~862MPa), 125ksi grade (yield strength is 125ksi~140ksi, that is, 862~965MPa), and 140ksi grade (yield strength is 140ksi~155ksi, that is, 965~1069MPa) Steel pipes for oil wells. [0003] Deep wells are mostly acid environments containing corrosive h...

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Application Information

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IPC IPC(8): C22C38/00C22C38/54C21D8/10C21D9/08
CPCC21D6/004C21D6/005C21D6/008C21D8/105C21D9/085C22C38/001C22C38/02C22C38/04C22C38/06C22C38/22C22C38/24C22C38/26C22C38/28C22C38/32C22C38/54C21D8/00C21D8/02C21D8/10C21D8/005C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/52
Inventor 吉田晋士荒井勇次相马贵志神谷裕纪
Owner NIPPON STEEL CORP
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